+ Init(sAlpha,sX,Ycoor,Zcoor,phi,tanlambda,curv,lab);
+
+}
+//____________________________________________________
+AliITStrackSA::AliITStrackSA(Double_t alpha, Double_t radius, Double_t Ycoor, Double_t Zcoor, Double_t phi, Double_t tanlambda, Double_t curv, Int_t lab ):
+fNSA(0)
+{
+ // standard constructor. Used for ITS standalone tracking
+
+ // get the azimuthal angle of the detector containing the innermost
+ // cluster of this track (data member fAlpha)
+
+ if (alpha<0) alpha+=TMath::TwoPi();
+ else if (alpha>=TMath::TwoPi()) alpha-=TMath::TwoPi();
+ Init(alpha,radius,Ycoor,Zcoor,phi,tanlambda,curv,lab);
+}
+//____________________________________________________
+ void AliITStrackSA::Init(Double_t alpha, Double_t radius, Double_t Ycoor, Double_t Zcoor, Double_t phi, Double_t tanlambda, Double_t curv, Int_t lab ){
+ // initialize parameters